Knowledge Of Evoh Material

What is Evoh? As a non-professional, you may not know much about this. But don’t worry, let me give you a brief introduction.

Evoh is a special material that is short for ethylene-vinyl acetate copolymer, also known as EVOH. It is a colorless transparent resin with a wide range of industrial and commercial applications. Evoh materials have excellent barrier properties and chemical resistance, so they are widely used in packaging, construction, medical and other fields.

First, let’s take a look at the barrier properties of Evoh materials. Evoh has excellent oxygen blocking properties, which can effectively isolate oxygen, thereby extending the freshness life of food. In addition, it also has good barrier properties, which can block the penetration of water vapor and odor, and maintain the freshness and quality of the items inside the package. Therefore, it is often used in food packaging, pharmaceutical packaging and cosmetic packaging and other fields.

Secondly, Evoh material also has excellent chemical resistance. It can resist the erosion of acids, alkalis, solvents and other chemicals, and maintain the stability and integrity of packaging materials. This makes Evoh materials widely used in medical device packaging, cosmetic packaging and industrial chemical packaging.

In addition to the above two points, Evoh material also has good processing properties and plasticity, can be processed into films, sheets, pipes and other forms of products by blow molding, extrusion, injection molding and other ways. Its high transparency, smooth surface, easy to print and coat, can meet the design and decoration requirements of different packaging needs.

In general, Evoh material is a functional material with excellent performance, with excellent barrier properties and chemical resistance, and is widely used in food packaging, pharmaceutical packaging, medical device packaging, building materials and other fields. With the continuous improvement of packaging quality and safety requirements, it is believed that Evoh materials will have a broader space for development in the future.

When extruding Evoh material, the choice of screw material is crucial to ensure product quality and performance. Commonly used screw materials include the following:

1)Chrome-molybdenum alloy steel: This material has high hardness, high strength, high wear resistance and strength and toughness at high temperatures. However, chrome-molybdenum alloy steel has the problem of hydrogen brittleness, which is easy to crack and fracture, and the price is high.

2)Austenitic stainless steel: Austenitic stainless steel has good corrosion resistance, high temperature strength and excellent mechanical properties. Its price is relatively affordable, so in some cases it is an ideal choice for extruding EVOH materials.

3)Alloy steel: Alloy steel also has the characteristics of high hardness, high wear resistance and high strength, but it is not corrosion resistant. Therefore, in practical applications, alloy steel is usually used in combination with other materials.

4)Tungsten molybdenum alloy: Tungsten molybdenum alloy has extremely high hardness and strength, while showing good wear resistance and corrosion resistance. However, its manufacturing process is more difficult and the price is more expensive.

When selecting the screw material required for extruding EVOH material, it is necessary to consider the performance, cost and actual production needs of the material. Customized selection and design may also be required for specific extrusion processes and product requirements. In addition, in order to ensure the stability of the production process and product quality, regular maintenance and replacement of the screw is also necessary.

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